Anyone who still states that air con is pointless, still does not know the benefits of a working system.
Increased fuel economy? Negligible now due to far more efficient compressors. Back in 1980, the compressor on a Lotus elite we had in the family, was huge and when turned on, you could physically feel it dramatically engage and sap power. These days,it's almost seemless and a car performs no different with it engaged to when it's not.
Opening a window? Really? When the penny has finally dropped as to how air quality is dire due to diesels being in abundance?
In damp conditions, you really want to endanger others by having misted up windows?
As stated, Use it or lose it is the name of the game with AC. lack of use will kill the system.
As to the original question? I avoided all POPs due to this very point. Sell it and buy a lounge. Plus you get so much more in a lounge over and above AC for little or no more money if sourced sensibly.